Sound recording and reproducing apparatus



Aug. 8, 1939. K. DANIEL SOUND RECORDING AND REPRODUCING APPARATUS FiledDec. 29, 1957 Patented Aug. 8, 1939 TENT,

SOUND RECORDING AND REPRODUCING APPARATUS Karl Daniel, Cologne-Sulz,Germany, asslgnor to Tefi-Apparatebau Dr. Daniel K.-G., Cologne,-

- Germany i Application December 29, 1937, Serial No. 182.179

In Germany January 2. I937 11 Claims.

This invention relates to a sound recording and reproducing apparatusfor recording and reproducing on endless band-like sound carriers bymeans of a plurality of longitudinallyrunning sound tracks.

In such sound apparatus as hitherto known, the passage or transferencebetween two adjacent sound tracks is effected by relative transversedisplacement between the sound carrier thereof by way of example byreference to the accompanying diagrammatic drawing, in which:

Fig. l is a perspective view of the most'important parts of a soundrecording and reproducing apparatus embodying the invention, togetherwith the pertaining electrical and mechanical control devices, and

Fig. 2 is a plan view of a detail to an enlarged scale.

The various control positions A-out, S-' 5 recording,- Hreproducing andSt-stop are effected by rotation of the control rod 75 which carries thecam disc iii. In the position Aout the main switch 28 is opened wherebyl0 and the sound box in dependence on an. electrithe whole mechanism iscut ofi from the current cal impulse which is released by a contact marksupply. In the remaining control positions, the provided on the soundcarrier. switch 28 is closed so that the motor l5 also re- If, in suchsound. apparatus, relatively long ceives current in the position Ststop.In sound carriers are employed, then it is. in practhe position"Srecording, the switches 28, 48

tice, essentlalto be able to trace or find rapidly and 29 are closedWhilst the switch 59, coupled 15 and surely the commencement of a soundrecord wi h t switch 9, s p In the position on the sound carrier and theprincipal object of Hrecording, the switch 68 is-opened whilst thisinvention is to provide means for enabling the remaining switches arenot actuated. In the this to be done. position St-stop", the switch 29is opened and According to the invention, in the circuit conthe switch59 sed, t c sw to cs B a d 8 be n 20 taining the means for efiecting therelative dislikewise closed. placement between the sound boxand thesound The endless band-like sound carrier 3, which carrier, is inserted.a switch which, with the sound runs over two rollers 22 and 22a isformed with carrier moving, effects as desired either the said i lrecess 2 in which, on each revolution 25 transverse displacement or thestopping of the ofthe sound carrier, n ges a contact pin which 2:) soundcarrier when an electric circuit is closed thereby closes momentarilythe t t The by the contact mark on the sound carrier. If, sound carrieris driven by a motor l5 o h thereiore,it-is desired to ascertain, in thecase of e gears 95 d W y means of the toothed sound recording, thecommencing position of the drum on Whichit is held y e p e er '30 soundcarrier or, in the case of sound reproducl9. The recording of the soundtracks is efiected 80 ing, the commencement of the sound record, thenaccording o t e needle Sound method. The all that isnecessary is for theaforesaid switch so nd tra ks a ut t t fi m b t p si to be brought intothe required control position tively tran ver ely moved cutting o r r nwhereupon the sound carrier will be driven until box 34 and arereproduced listened to y e 35 it is automatically sto ped by the closingof an pr u n nd x 35 h n dl of which 35 electric circuit by the contactmark provided is guided in the sound track- For this reason. on the saidcarrier. Advantageously, care should the reproducing sound boX 35 is e ym vable be taken that this control position is only ossin a supporting rd 38 y m ans of rollers 36 Me when the sound boxes areshut off ordiscond relieving the sound boxes of load 40 nected so that the soundcarrier automatically or for c e Weight adjustment thereof in 40 find tcommencing position, so to speak, with lation to the hardness of thematerial constitutout any 1Oad I the carrying out 6f the invem ing thesound carrier, adJustable counter-weights tion a number of features areprovided which and i are provlded' A brake path 42 45 relate to asuitable arrangement and assembly $3322 gg g gfi fig g ggfi ggz 22:22:234

333 2;; g fii zfig g gfigigg g ggg s? carrier 3 which rotates withuniform speed in the direction of the arrow (Fig. 1). A continuousthesound apparatus smoothing of the sound carrier is effected be- In orderthat the mventlon may be tween the rollers 22 and 22a. by deflection orderstood. we shall now describe one embodiment changing the direction ftravel of the sound 50 carrier, which is preferably produced. by theshaving remover M which is also driven by the motor-l5.

For effecting the transverse movement of the slide 20 of the cutting box34, a woundup spring 32 is provided, the running down of which, afterbeing released, is controlled or retarded by the electromagnet 5 bymeans of a small synchronous motor 33. or another suitable control, forexample a vane wheel.

I! it is desired to commence recording, cam disc 3| is first rotated toSt-stop" whereby the switch 23 is opened and the switch 59 is closed.The motor I5 is now switched in and the circuit is completed from thenetwork at 43 through the main switch 28, the contact 3|), arranged inparallel with the switch 23 to the motor l5 and back into the network at44.

In parallel with the motor connection is a rectifier 45 and a smoothingcondenser 48; The rectifier 45 serves for feeding the electromagnets 5and 41. v

As soon as the recess 2 in the sound carrier 3 closes the contactcontinuous current flows through the rectifier 45 to the electromagnet5, the clutch or contact I, switch 48, contact 38 and through the mainswitch 28 into the network at 43 from which it was taken at 44. Theelectromagnet 5 draws the armature 8 whereby the contacts I and 49 areclosed. In series with the contact 1 is the contact 8 which itself isinserted in parallel with the contact of the sound carrier. The magnet 5thus remains excited even after opening of the contact I owing to thepassage of the recess 2 in the sound carrier 3 and thus retains itsarmature 6.

The armature 5 releases the pin 24 on the contact disc l3. Thus thecontact disc I3 is rotated under the action of the wound-up spring 32through the locking pinion 5| and the pawl 52 arranged on the pinion 53,the uniform rotation of the said disc l3 being controlled by thesynchronous motor 33 which has received current owing to the closing ofthe contact 49. The path of the current to the synchronous motor 33 isfrom the network at 44 through the contact 49, the synchronous motor 33,contact 30 and the main switch 28 back to the network at 43.

A toothed pinion 58, which is in engagement with a rack 51 secured tothe slide 28, is carried by the spindle 62 of the spring 32 at the lowerend thereof so that, on the rotation of the spindle 62, a transversemovement of the sound box 34 takes place. The transverse movement of thesound box 34 continues until the pin 24, provided on the contact disc l3or another pin, runs against the cam 58 of the contact 3. As shown inFig. 2, the contacts 33 and 58 are coupled to the contact 8 in such amanner that, on the opening of the contact 8 by the engagement of thepin 24 with the cam 53 the contact 38 is simultaneously opened and thecontact 58 closed. On the opening of the contact 8, the armature 6 isfirst released as the contact 8 is in series with the contact 1 and thusthe electromagnet 5 is disconnected.

The opening of the contact 30 interrupts the circuit to the motor |5which is thus stopped.

The closing of the contact 58 allows a continuous.

current to flow from the network at 44 through the rectifier 45 to theelectromagnet 41 and through the contact 58, the switch 53, which isclosed with the control on St-stop", and the main switch 28 back intothe network at 43. I

The electromagnet 41 draws its armature 60 towards itself and thus stopsthe further running of the synchronous motor and the unwinding of thespring 32 and consequently also stops the farther transverse movement ofthe cutting box the I A spring 18, engaging the rack 51, equalises thetooth space between the rack 51 and the pinion 55 and connects the twoin a force closure manner. The spring 16 can, however, be madesufliciently strong that thereby the spring 32 may be dispensed with.

The sound carrier 3 is now in the commencing position and the wholearrangement can be put out of circuit by turning the cam disc 3| to A-out as the main switch 28 is then open. The cam disc 34 may, however,also be turned to the position S-recording" or H-reproducing".

In all the three positions, S-recording, H- reproducing" and A--out",the switch 53 is always opened. The electromagnet 41 is thus notsupplied with current and the armature is left free and also thesynchronous motor 33. The contact disc l3 thus rotates for a fraction ofits path until its pin 24 strikes against the armature 8, whereupon thecam 59 of the coupled contacts 8, 38 and 58 is freed and the contacts 8and 30 are closed and 58 opened.

,The switch 23 closed when the cam disc 3| is on S-recording andH-reproducing, prevents, during recording and reproducing, the motor |5from being put out of circuit and thus stopped owing to the interruptionor the breaking of the contact 30 after the transverse movement of thesound box 34 has been eflected.

When the cam disc 3| is turned to Reproducing, the switch 48 is opened.As this switch 48 is in series with the contact I, then on the closingof the said contact at the control position 2, no transverse movement ofthe reproducing or listening box 35 can take place. This is indeedsuperfiuous as the needle of the box 35 is automatically guided in thesound tracks.

It will be obvious that a positive transverse movement must be given tothe box 35 if the sound apparatus is operating in accordance with thelight sound method. In this case, the switch 48 is omitted and thecontrol current for the magnet 5 passes instead to the magnet whichreleases the transverse movement of the sound box 35.

As, in the various control positions, a predetermined position of thesound boxes is necessary, a device is provided whereby the necessaryposition of the sound boxes is automatically obtained in dependence onthe rotary movement of the control rod. For this purpose, a shaft,carrying control cams 10 and 10a, 'engages the control rod 15 by meansof a bevel gear. On these control discs are pressed resilientlydouble-armed levers 1| and 12, the free ends of which engage under pins13 and 14 of the swingably carried sound boxes 34 and 35. Thearrangement of the control discs 13 and 10a is such that in the positionSt-stop and A-out both boxes are raised from the sound carrier 3 whilst,in the position S--recording, the box 35, and, in the positionIL-reproducing, the box 34, is held in the raised position.

In order to keep a check on the recordings on a sound carrier and inorder rapidly to be able to find the individual recordings, a scale 8|is provided, over which two pointers 83 and 53 are movable. The pointer83 is coupled to the shaft 82 of the spring 32 by a tension cord or inany other suitable manner. It shows how many sound lines have been madeon the sound carrier during recording.

On the scale 8| itself marks indicating the beginning and end of eachsound recording can be made. Moreover, the mass of the sound record isgiven or registered on the scale so that, byproviding exchangeablescales, these can be used as an indication of the contents of any soundcarrier. In order, on the reproduction of a sound carrier, to pick upany sound recording, the scale appertaining .to the sound carrier isplaced in position, whereupon the. pointer 69 is adjusted to thecommencement of the desired part to be reproduced. The pointer 69 iscoupled with a shaft 64 which is in-engagement through the pinion 65 andthe rack 65 with the reproducing sound box 35, so that, on thedisplacement of the pointer 69, the sound box 35 is at the same timedisplaced transversely to the path of the sound carrier. In order to beable to obtain an accurate adjustment to the desired sound track, a stopwheel K61, with a stop (it, is provided on the shaft 64, the wheel 67being provided with teeth corresponding in number to the number of soundtracks which can be made on the sound carrien.

As all the control positions of the, sound apparatus are produced bymeans of a common control shaft 15, a remote control of the soundapparatus can obviously be efiected in a simple manner.

I claim:

1. In a sound recording and reproducing apparatus of the type referredto, the combination of a sound box; a longitudinally movable endlesssound oarrier associated therewith; means .for driving said soundcarrier; an electric circuit for actuating said driving means; a secondcircuit operable to efiect relative transverse movement between saidsound carrier and said sound box; an electromagnet included in saidcircuit; a pivoted armature associated with saidmagnet; means operableby said electromagnet for effecting said relative transversedisplacement; a normally-closed contact arranged in parallel with saidsecond circuit; a normally-open contact arranged in series with saidparallelly-arranged contact, said open contact being adapted to beclosed on movement of said armature; a second normally-closed contactincluded in both said circuits, a switch arranged parallel with saidsecand contact, and a main contact adapted to be closed by movement ofsaid sound carrier to effect said transverse displacement and, with saidswitch closed, to allow of continuation of movement of saidcarrier and,with said switch open, the stopping of said carrier.

2. In a sound recording and reproducing apparatus, the subcombinationof: a sound box; a

longitudinally movable endless sound carrier as) sociated therewith;driving means for said sound carrier; an electric circuit for actuatingsaid driving means; asecond electric circuit for eiTecting relativetransverse displacement between said sound carrier and said sound box;means for retarding said displacement; a switch in series in saidfirst-mentioned circuit, and a main contact in said second circuitoperable, on movement of said carrier, to close said circuit, whereby inone position of said switch. said relative transverse movement may beeffected with continued longitudinal movement of said carrier and inanother position thereof, said carrier is stopped.

3. Ina sound recording and reproducing apparatus, the subcombination of:a sound box; a longitudinally movable endless sound carrier associatedtherewith; means for driving said sound carrier; mechanism for'effectingrelative transverse displacement of said carrier and said sound box,said means including a rotatable disc having a pin thereon, said discbeing operatively con-- nected by gearing to said sound box; an electricto be closed momentarily by movement of said carrier therepast; a secondnormally-closed contact in both said circuits; and a switch in parallelwith said last-mentioned contact, the arrangement being such that, onthe closing of said first-mentioned contact by movement of said carrier,said disc is caused to rotate to effect the required transversedisplacement of said sound box, whereupon said pin on said disc openssaid second mentioned contact thereby breaking said second electriccircuit, said carrier driving means circuit being also broken if saidswitch is open and rema'ining closed if said switch is closed.

4. In a sound recording and reproducing apparatus, the subcombinationof: a sound box; a longitudinally movable endless sound carrierassociated therewith; driving means for said carrier; an electriccircuit for actuating said driving means operable to efiect relativetransverse displacement or said sound carrier and said sound box; asynchronous motor associated with said second circuit operable to retardsaid means;

means for preventing rotation of said synchronous motor; a main contactin said second circuit adapted to be closed by passage of said carriertherepast; and a switch in series with said first-mentioned circuit,said switch being adapted, in one position thereof, after a transversedisplacement of said sound box has been effected, to allow continuationof movement of said car- ,rier and in another position thereof to stopsaid carrier.

5. In a sound recording and reproducing apling said carrier drivingmeans; a second electric circuit for releasing said disc rotating means;a normally-closed contactarranged in both said circuits, said contactbeing adapted to be opened by the striking of said pin thereagainstonrotation of said disc on release of said mechanism; a synchronous motoroperatively connected to said disc for retarding the rotation thereof;an electromagnet associated with said synchronous motor; an armature forsaid electromagnet operable on energisation of said magnet to lock saidsynchronous motor against rotation; acircuit for actuating saidelectromagnet; a normally-open contact in said circuit, said contactbeing adapted to be closed on the opening of said normally closedcontact; a switch in parallel with said normally-closed contact; asecond switch associated with said first-mentioned switch and includedin the circuit of said electromagnet in such manner that said switch isopen when-said first-mentioned switch is closed whereby, when saidfirst-mentioned switch is closed, said carrier driving means circuitremains closed and said electromagnetic circuit is open.

6. In a sound recording and reproducing apparatus, the combination of: alongitudinally movable endless sound carrier;

a recording sound 76 box associated therewith; means for moving saidcarrier; means for effecting relative transverse displacement of saidcarrier and said sound box and a single control means, operable onmovement of said carrier, for actuating said transversedisplacement-means and for stopping the movement of said carrier at anypredetermined point on said carrier.

7. In a sound recording and reproducing apparatus, the combination of alongitudinally movable endless sound carrier having a marginal recess atany predetermined point therealong; a recording sound box associatedtherewith; electrically-controlled means for moving said carrier;electrically-controlled means for effecting relative transversedisplacement of said carrier and said sound box and a single maincontact member associated with said electrically-controlled meansadapted to be closed on passage therepast of said marginal recess insaid carrier to set said transverse displacement means in operation andto stop the movement of said carrier after a transverse displacement hasbeen efiected.

8. In a sound recording and reproducing apparatus of the type referredto: a longitudinally movable endless sound carrier; 9. recording soundbox associated therewith; means for driving said sound carrier; a firstelectric circuit for actuating said driving means and a second circuitfor effecting relative transverse displacement between said soundcarrier and said sound box; a normally closed contact included in bothsaid circuits and adapted to be opened at the end of said relativetransverse movement; a switch arranged in parallel with said contact;and means, operable on movement of said carrier, to close said secondcircuit to cause, in one position of said switch, said transversedisplacement with continued movement of said carrier in the samedirection and in the other position of said switch, said transversedisplacement and subsequent stoppage of said sound carrier.

9. In a sound recording and reproducing ap paratus of the type referredto: a longitudinally movable endless sound carrier; 9. recording soundbox and a reproducing sound box associated with said carrier; means formoving said carrier; means for eflecting relative transversedisplacement of said carrier and said recording sound box; a singlecontrol means, operable on movement of said carrier, for actuating saidtransverse displacement means and ior stopping the movement of saidcarrier at any predetermined point on said carrier; and means for movingsaid sound boxes towards and away from said sound carrier as required.

10. In a sound recording and reproducing apparatus, the combination of:alongitudinally movable endless sound carrier; a recording sound boxassociated therewith; means tor moving said carrier; means foreflfecting relative transverse displacement of said carrier and saidsound box; a single control means. operable on movement of said carrier,for actuating said transverse displacement means and for stopping themovement of said carrier at any predetermined point on said carrier; andan indicating device, operable on said relative transverse displacement,for indicating the extent or a recording.

11. In a sound recording and reproducing apparatus of the type referredto: a sound box; a longitudinally movable endless sound carrierassociated therewith; means for driving said sound carrier in onedirection; a first electric circuit for actuating said driving means;and a second circuit adapted to be closed by movement of said carrier toeffect relative transversedisplacement between said sound carrier andsaid sound box; a normally closed contact included in both said circuitsand said contact being adapted to be opened momentarily at the end ofsaid relative transverse movement; and a switch in parallel with saidcontact, said switch being adapted, in

the closed position, to maintain said first circuit closed, in spite ofthe opening of said contact, for

the purpose specified.

KARL DANIEL.

